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Curated Best-Of List

Best Composting Toilet

5 expert-curated picks ranked by performance, value, and long-term reliability

Composting toilets process waste through aerobic decomposition — separating liquids from solids and turning solid waste into compost via biological breakdown. They're the right choice for: off-grid cabins, tiny houses, boats and RVs without holding tanks, and properties where running a standard sewage line is impractical or impossible.

The two main types are self-contained units (toilet, processing chamber, and exhaust fan are integrated — Nature's Head, Separett Villa, Sun-Mar Excel are the popular choices) and central composting systems (large remote composting tank serving multiple bathrooms — Clivus Multrum, Phoenix Composting Toilet System). Self-contained units cost $900–$1,800 and serve 1–4 people; central systems cost $5,000–$15,000+ and serve larger households or multi-bathroom installations.

The key buying considerations: power source (Nature's Head requires 12V DC fan; Separett uses small 110V), urine diversion (most modern designs separate urine for separate disposal — this is the technology that makes composting toilets actually work without odor), and capacity (lighter-use units handle 1–2 people; full-time off-grid needs higher-capacity options).

Our top pick for off-grid residential and tiny house use is the Nature's Head Composting Toilet ($1,030) — proven design, easy maintenance, runs on 12V, handles 2 people full-time or 4 people part-time. For larger off-grid households, the Sun-Mar Excel NE ($1,750–$2,100) is the upmarket choice.

5 products
$169 – $460
Updated May 2026

Quick Comparison

# Product Brand Rating Price
1 TOTO Drake II Two-Piece Elongated 1.28 GPF Toilet TOTO 4.9 Check current price Amazon
2 Gerber Wicker Park One-Piece Elongated 1.28 GPF Designer Toilet Gerber Plumbing 4.9 Check current price Amazon
3 Gerber Viper Two-Piece Compact Elongated 1.28 GPF Toilet Gerber Plumbing 4.9 Check current price Amazon
4 Gerber Avalanche Two-Piece Elongated 1.28 GPF Comfort Height Toilet Gerber Plumbing 4.9 Check current price Amazon
5 Glacier Bay Pressure-Assist Two-Piece Elongated 1.28 GPF Toilet Glacier Bay 4.9 Check current price Amazon
3
#3 Pick
Gerber Plumbing

Gerber Viper Two-Piece Compact Elongated 1.28 GPF Toilet

4.9 (1,468)
Standard vitreous china Two-piece compact-elongated, Comfort Height 1000 Compact-Elongated Gerber ViPER Gravity (3-inch flush valve)
from Check current price Check Price on Amazon Full Specs
Why we picked it: Gerber Viper — compact-elongated bowl with ViPER flush at sub-$250. Tight-bathroom WaterSense Comfort Height with commercial-grade evacuation.
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4
#4 Pick
Gerber Plumbing

Gerber Avalanche Two-Piece Elongated 1.28 GPF Comfort Height Toilet

4.9 (1,466)
Standard vitreous china Two-piece elongated Comfort Height, commercial-residential bridge build 1000 Elongated Gerber ViPER Gravity (3-inch flush valve)
from Check current price Check Price on Amazon Full Specs
Why we picked it: Gerber Avalanche — the brand's mainstream WaterSense flagship. Commercial-residential bridge build at $210-$290 with best-in-class plumber-channel reputation.
5
#5 Pick
Glacier Bay

Glacier Bay Pressure-Assist Two-Piece Elongated 1.28 GPF Toilet

4.9 (1,459)
Standard vitreous china Two-piece elongated with pressure-vessel tank 1000 Elongated Pressure-Assist (pressure vessel in tank, ~25-80 PSI)
from Check current price Check Price on Amazon Full Specs
Why we picked it: Glacier Bay Pressure-Assist Elongated — Flushmate-equivalent pressure-vessel flush at sub-$230. The Glacier Bay for buyers who need stronger flush than gravity provides.